Die head



May 14, 1 929. A, BARTEIT 1,713,319

DIE HEAD Filed May 8, 1926 Patented May 14, 1929.

v UNITED-STATES PATENT oFFic EWALD A. BARTEIT, OF NEW I-IAVEN,- CONNECTICUT, ASSIGNOR TO THE GEOMETRIC TOOL 00., OFNEW HAVEN, CONNECTICUT, A CORPORATION. p

DIE HEAD.

Application filed May 8,

Fig. 1. A view mainly-in side elevation and partly in longitudinal'section of a die-head embodying my invention.

Fig. 2. A plan view, thereof with partof the operating-sleevebroken away,

ig. 3. A view thereof mainly in front elevation and partly in vertical section.

Fig. 4. A detached View in front elevation of one of the spring-actuated retractingplungers; Y

Fig. 5. An end view thereof. v Fig.6. A detached view in side elevation My invention relates to an improvement in die-heads'ofthat class having radially- :movablechasers forced inwardly into their cutting positions by means of an operatingmember which has chaser-operating, chaserretracted, and chaser-clearance positions, the object being to produce a simple, convenient and effective tool c'onst'ructed'with particular reference to yieldingly holding the chasers in the tool whenthe said operating-member is moved'into its chaser-clearance position, in which the chasers are inserted'into' and re moved from the fixture. v

'W'ith these ends in view, my invention consists in a die-head having chaser-s, an'opcrating-member -"therefor,;and means for yielfdingly retaining the chasers'in the die head when the said operating-member is moved into its chaser-clearanee position.

My invention further consists in adiehead characterized as above and liaving'i'rictional means for yieldingly 'retaining the chasers in the die-head when tlie'said operating-member is moved into its chaser-clearance position. Y

My invention further consists in a diehead having certain details of construction and combinations of partsas will be hereinafter described and particularly recited in the claims. 7 I

In carrying out my invention, as herein shown, it is embodied in a die-head of standard construction. having a skeleton-body '10 provided with a shank 11 by means of. which it is mounted for use. The said body mounts a chaser-operating member inthe form of a sliding operating-sleeve 12 adjusted in its position for varying the cutting diameter of the die-head by means of anordinary adjusting-nut 13, the said sleeve havinga forward or operating position, an intermediate or here and slots being connectedby'p'a-ss 23 through which the pins 19 project 1926. SeriaI No. ibne ia- 1 --For the retraction of the several chaser-s 15, each is provided w th a rearwardly-project in'g pin 19.] These pins'enter 'notchesZO respectively formed in the outejr ends of each of fourradially-movable plungers 21 located in as many cylindrical chambers 22 formed in the die-body 10 at points directly back of the chaser-slots 14 aforesaid, the said chamages 7 into the-chambers '22, in which the plungers are -10ca ted,'as aforesaid. The said pliingers are provided with bo'res'2t entering thei'n' from their inner ends for the reception of chaserretractingsprings 25 by which the plungers and hence'th'e chasei's are radially retracted into their retiredlpositions when theOperating-slee've 12 1S moved rearwardly into its intermediate and chaser-clearance positions.

To limit the out-wardv movement of the plungers 21- under the "influence of-the springs 25, stop-screws 26 are mounted in the die-body 10in position to be engaged by the outer ends of the plungers'when' they have been pushed to the outward'limit of y ,theii' radial movement by the said springs 25.

Normally, thechasers 15 are held in the .radialslots 14 by the direct engagement of their outer ends tyne sleeve 12when the same is in its operating and intermediate positions, as shown by full lines and by broken lines 27 respectively in Fig. 1.

To prevent the chassis 15 from falling out of the slots 14 when the sleeve is moved into its fully-retired or chaser-clearance position, as shown by broken lines 28 inFi'g. 1, their pins 19 are frictionally, and therefore 1100 yieldingly, gripped between the pairs of fingers 29 formed by the production of the iotches 20 in the outerv ends of the plungers for the reception of the pins. To secure added resiliency, the plungers are formed with longitudinal slots 30 which permit one of each air of the said fingers to be set inwardly or the resilient holding of the pins which their notches 20 receive, the plungers themselves being held in the die-head by the stop-screws 2G aforesaid and in turn yieldingly gripping the pins 19 ot' the chasers to prevent the same from falling ontot the tool by gravity or vibration, 12 thereof is moved into its chaser-clearance position, as shown by the broken lines This yielding coupling of the chasers 1n the manner described with the plungers does not interfere with the easy manual withdrawal of the chasers from the tool when required. On the other hand, it facilitates the assembling of the chasers in the tool by enabling them to be individually snapped into place, as it were, without the necessity of manually holding them in place until all have been positioned, and the sleeve has been moved into engagement with their outer ends.

I would have it understood that the term spring-pressed} asused herein, is intended by me to cover a member which is in itself resilient, as, for instance, one of the two fingers 29 of the respective plungers, or any other member intrinsically resilient or a nonresilient member acted upon by a separate spring. V 4

Furthermore, in referring to a member as engaging with a chaser, I wish to be understood as including within the scope ot such term a member directly engaging with the chaser or indirectly through the medium of a part carried thereby. I

I claim:

1. A die-head having chasers, an operating-member for operating them and holding them in place, spring-actuated plungers each having a resilient finger, and pins connectin the chasers and plungers andengaged by the finger of the latter for yieldingly retaining the chaser-s in the die-head when the operating-member thereof is in its chaser clearance position.

2. A diehead having radially-movable and radially-removable chasers, a chaser operating sleeve having chaser-closing, chaser retracted, and chaser-clearance positions, radiallyemovable spring-actuated plungers when the sleeve located in the die-head, pins carried by the said chaser-s and engaged by said plungers,

and spring-pressed means 'yieldingly con necting the chasers and plungers through *ithdrawal therefrom when the said sleeve is moved into its chaser-clearance position.

3. A die-head having radially-movable chasers, a chaser operating sleeve having chaser-closing, chaser-retracted and. chaserclearance positions, pins carried by the respective chasers, radially-movable springactuated plungers located in the die-head, notched-tor the reception of the said pins and slit for theproduction of fingers set to frictionally engage the said pins for yieldingly coupling the chasers with the plungers for yieldingly holding the chasers in the diehead when the sleeve is moved into its chaser-clearance position.

4:. A die-head having radially-movable and radially-removable chasers, a chaseroperating member having chaser-closing, chaser-retracted and chaser-clearance positions, and means for yieldingly retaining the chasers in the die-head against radial withdrawal therefrom when not positively held therein by the said chaser operating member, said means including a springpressed member engaging the respective Chasers.

l 5. A die-head having radially-movable and radially-removable chasers, a chaseroperating sleevehaving chaser-closing, chaser-retracted and chaser-clearance positions, radially-movable spring-actuated plungers for the retraction of the chasers, means for limiting the radial outward movement of the plungers, andmeans for yieldingly'coupling the chasers with the plungers to prevent the radial withdrawal of the chasers from the die-head when not positively held'therein by the said sleeve.

In testimony whereof, have signed this 7 specification.

EWALD A. BARTElT. 

